CTS 2003-2005

Bleeding

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  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
    NOTE
    With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF. This will discharge the hydro-boost accumulator.

  2.  
  3. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2.  
    3. Firmly apply the brake pedal 10-15 times.
    4.  
    5. Turn the engine OFF.
    6.  

  4.  
  5. Raise the vehicle until the front wheels are off the ground.
  6.  
  7. With the key on engine OFF, turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  8.  
  9. Verify power steering fluid level.
  10.  
  11. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  12.  
  13. Verify the fluid level. Repeat the bleed procedure, if necessary.
  14.  

The power steering fluid replacement procedure is a two-stage process: first, flushing the old fluid from the system with new fluid and second, bleeding the system to remove any trapped air. The following sequences outline these procedures.

  1. Raise and safely support the front end of the vehicle off the ground until the front wheels are free to turn.
  2.  
  3. Remove the fluid return line at the pump reservoir inlet connector.
  4.  
  5. Plug the inlet connector port on the pump reservoir.
  6.  
  7. Position the fluid return line toward a container (several quart capacity) to catch the draining fluid.
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  9. When an assistant fills the reservoir with either the standard power steering fluid or optional cold weather power steering fluid, start and run the engine at idle.
  10.  
  11. Turn the steering wheel from stop-to-stop.
  12.  


WARNING
Do not hold the steering wheel against the stops while flushing the system. Holding the steering wheel against the stops will cause high system pressure, overheating and damage to the pump and/or the steering gear assembly.

  1. Continue draining until all of the old fluid is cleared from the power steering system. The addition of another quart of fresh fluid will be required to flush the system.
  2.  
  3. Turn the engine OFF . Unplug the pump reservoir inlet and reconnect the return line.
  4.  
  5. Fill the reservoir to the FULL COLD mark.
  6.  



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Fig. Power steering system bleeding

After replacing the fluid or servicing the power steering hydraulic system, you must bleed air from the system. Air in the system prevents an accurate fluid level reading, causes pump cavitation noise and over time could damage the pump. To bleed the power steering system, proceed as follows.

  1. Begin with the engine OFF , front wheels off the ground and the wheels turned all the way to the left.
  2.  
  3. Add either standard power steering fluid or optional cold climate fluid to the FULL COLD mark on the fluid level indicator.
  4.  
  5. With the engine still OFF , bleed the system by turning the wheels from stop-to-stop, but without hitting the stops.
  6.  


NOTE
This may require turning the wheels from side to side up to 40 times. Keep the fluid level at the FULL COLD mark. Fluid with air in it may have a light tan appearance. This air must be eliminated from the fluid before normal steering action can be obtained.

  1. Start the engine. With the engine idling, recheck the fluid level. If necessary, add fluid to bring the level to the FULL COLD mark.
  2.  
  3. Return the front wheels to the center position. Verify that the transaxle is in PARK and that the parking brake had been firmly set. Lower the front wheels to the ground. Continue running the engine for two or three minutes.
  4.  
  5. Test drive the vehicle to be sure the power steering functions normally and is free from noise.
  6.  


NOTE
Inspect for fluid leakage at the connection points along the power steering system.

  1. Recheck the fluid level. The fluid level should now be up to the FULL HOT mark after the system has stabilized at operating temperature.
  2.  

 
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